substructum
From LSJ
Περὶ τῶν ἐν κεφαλῇ τρωμάτων → Wounds in the Head, On Head Wounds
Latin > French (Gaffiot 2016)
substrūctum, ī, n. = substructio : Vitr. Arch. 8, 7.
Latin > German (Georges)
substrūctum, ī, n. (substruo), der Unterbau, Grundbau, Vitr. 8, 6, 6.